Is your feature request related to a problem? Please describe.
It is not possible to create e.g. AWS integration with agentless policy

Describe the resource you would like to have implemented.
kbn:/api/fleet/agent_policies

Describe the solution you'd like
In resource elasticstack_fleet_agent_policy add the ability to set supports_agentless

Describe alternatives you've considered
Neither writing a script nor creating it through the UI is a good alternative.

Additional context